Printing ribbon cassette



FIG. 1 is a front right perspective view of a printing ribbon cassette showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a right side elevational view;

FIG. 5 is a left side elevational view;

FIG. 6 is a bottom plan view;

FIG. 7 is a rear elevational view; and

FIG. 8 is a rear left perspective view. 

The ornamental design for printing ribbon cassette, as shown. 